Remove custom posts that match taxonomy value

something along these lines should do it:

$args = array(
        'post_type' => 'listings',
        'posts_per_page'=> -1,
        'post_status' => 'any',
    'tax_query' => array(
        array(
            'taxonomy' => 'status',
            'field' => YOUR FIELD NAME HERE???
            'terms' => 'standard'
        )
    )
);
$query = new WP_Query( $args );

foreach( $query->posts as $id ){
           wp_delete_post( $id->ID, TRUE );
      }